Extra exam question E4C03
Subelement E4, AMATEUR PRACTICES· Group E4C
What is the term for the suppression in an FM receiver of one signal by another stronger signal on the same frequency?
- A.Desensitization
- B.Cross-modulation interference
- C.Capture effect (correct answer)
- D.Frequency discrimination
WhyCapture effect is the term for an FM receiver suppressing one signal in favor of a stronger signal on the same frequency. Capture effect is the term for an FM receiver locking onto and demodulating the stronger of two same-frequency signals while essentially suppressing the weaker one, a characteristic quirk of how FM demodulation works, answer C. Desensitization is a different phenomenon (reduced sensitivity from a strong nearby signal), cross-modulation interference involves unwanted modulation transfer, and frequency discrimination isn't the standard term for this effect.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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